Reading values from olfs.xml file is fragile

Details

Description

Please fix this ASAP since it's very hard to debug.

I used the olfs.xml file to set the log file path and default ping values, however, it failed even though the code clearly was reading the values from the log file. I found that the code to extract values using the XPaths for the HyraxLogfilePath and DefaultPing elements is very easy to break. If the XML file is formatted like this: